I remember when I hosted ~2 years ago, that even when I closed the game, Steam would still think I’m playing Unturned because BEService.exe was still running after the game was closed. I assume BEService.exe continues to run, because I am also running an Unturned server on the same computer. It used to be as simple as just forcing BEService to close through task manager, but that is impossible now because windows simply says “The operation could not be completed. Access is denied”
I haven’t had this issue in a long time, try clicking stop on Unturned in the Steam library. I don’t know if it fixes the issue or not but it helps with a few other games that do something similar.